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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.4 = 23.1/x-1 // - 23.1/x-1
1-(23.1/x)+1.4 = 0
1-23.1*x^-1+1.4 = 0
-23.1*x^-1 = -2.4 // : -23.1
x^-1 = 0.1038961
-1 < 0
1/(x^1) = 0.1038961 // * x^1
1 = 0.1038961*x^1 // : 0.1038961
9.62500036 = x^1
x = 9.62500036
x = 9.62500036
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